It largely depends on your skill set (there's a lot more to know than what they teach in school), and it depends on the complexity of the projects you'll be working on. In my experience, starting salary in your situation could range from $12/hr if you're going to do basic work for a mill, to $30/hr if you're going to do complex work for an agency with big-name clients.

As Jeff points out, the range can vary. Obviously the location in the country will cause wild fluctuations in salary range but that aside, experience and the type of industry you find a job in will affect how much you make. For instance in the private sector you will make a lot more than for something in the public sector such as for a public university or state agency. Conversely, a smaller company or startup may offer much less than a more established business.